Due to the huge differences between the unconventional shale and conventional sand reservoirs in many aspects such as the types and the characteristics of minerals, matrix pores and fluids, the construction of shale rock physics model is significant for the exploration and development of shale reservoirs. To make a better characterization of shale gas-bearing reservoirs, we first propose a new but more suitable rock physics model to characterize the reservoirs. We then use a well A to demonstrate the feasibility and reliability of the proposed rock physics model of shale gas-bearing reservoirs. Moreover, we propose a new brittleness indicator for the high-porosity and organic-rich shale gas-bearing reservoirs. Based on the parameter analysis using the constructed rock physics model, we finally compare the new brittleness indicator with the commonly used Young’s modulus in the content of quartz and organic matter, the matrix porosity, and the types of filled fluids. We also propose a new shale brittleness index by integrating the proposed new brittleness indicator and the Poisson’s ratio. Tests on real data sets demonstrate that the new brittleness indicator and index are more sensitive than the commonly used Young’s modulus and brittleness index for the high-porosity and high-brittleness shale gas-bearing reservoirs.

中文翻译：

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高孔隙度页岩含气油藏页岩物理模型及脆性预测

由于非常规页岩储层与常规砂岩储层在矿物类型，特征，基质孔隙和流体等诸多方面存在巨大差异，因此页岩岩石物理模型的建立对于页岩储层的勘探和开发具有重要意义。为了更好地表征页岩气含气储层，我们首先提出了一个新的但更合适的岩石物理模型来表征储层。然后，我们使用井A来证明所提出的页岩气含气储层岩石物理模型的可行性和可靠性。此外，我们为高孔隙度和富含有机物的页岩气含气藏提出了一种新的脆性指标。基于使用构建的岩石物理模型进行的参数分析，最后，我们将新的脆性指示剂与常用的杨氏模量进行了比较，包括石英和有机物含量，基质孔隙率以及填充流体的类型。我们还通过整合拟议的新脆性指标和泊松比来提出新的页岩脆性指数。对真实数据集的测试表明，对于高孔隙度和高脆性的页岩气含气储层，新的脆性指标和指数比常用的杨氏模量和脆性指数更敏感。